Air separation unit heat exchanger with porous boiling surface coatings
First Claim
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1. A heat exchange surface in an air separation unit, comprising:
- a substrate;
a porous coating applied to a surface of the substrate, the porous coating comprising aluminum, magnesium and tin metallic particles, wherein the aggregate amount of magnesium metallic particles and tin metallic particles is not greater than 15 wt % of the weight of the porous coating, and wherein the aggregate amount of metallic particles that are aluminum or aluminum alloys is greater than 78 wt %;
wherein the porous coating has an average particle size diameter ranging from about 35 μ
m to about 55 μ
m;
wherein the porous coating has a thickness ranging from about 300 μ
m to about 400 μ
m;
wherein the porous coating has a median pore diameter ranging from about 7 μ
m to about 12 μ
m; and
wherein the porous coating has an overall porosity ranging from about 40% to about 60% based on the overall volume of the porous coating.
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Abstract
A porous metallic coating is provided. The coating is characterized by a combination of optimized properties that improve coating performance, as measured by heat transfer efficiency. The porous coating has optimal ranges for properties such as porosity, particle size and thickness, and has particular applicability in boiling heat transfer applications as part of an air separations unit. The porous coatings are derived from slurry-based formulations that include a mixture of metallic particles, a binder and a solvent.
28 Citations
20 Claims
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1. A heat exchange surface in an air separation unit, comprising:
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a substrate; a porous coating applied to a surface of the substrate, the porous coating comprising aluminum, magnesium and tin metallic particles, wherein the aggregate amount of magnesium metallic particles and tin metallic particles is not greater than 15 wt % of the weight of the porous coating, and wherein the aggregate amount of metallic particles that are aluminum or aluminum alloys is greater than 78 wt %; wherein the porous coating has an average particle size diameter ranging from about 35 μ
m to about 55 μ
m;wherein the porous coating has a thickness ranging from about 300 μ
m to about 400 μ
m;wherein the porous coating has a median pore diameter ranging from about 7 μ
m to about 12 μ
m; andwherein the porous coating has an overall porosity ranging from about 40% to about 60% based on the overall volume of the porous coating. - View Dependent Claims (2, 3, 4, 5, 6, 7, 8, 9, 10, 11, 12, 13)
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14. A shell and tube heat exchanger for use in an air separation unit, comprising:
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a shell; a plurality of heat exchange tubes disposed and retained within the shell, each heat exchange tube having a boiling surface and a heat input surface, the shell and tube heat exchanger configured to allow a one fluid to flow through the heat exchange tubes and another fluid to flow within the shell and outside the heat exchange tubes; and a porous coating applied to the boiling surface of each of the plurality of heat exchange tubes, the porous coating comprising aluminum, magnesium and tin metallic particles; wherein the aggregate amount of magnesium metallic particles and tin metallic particles is not greater than 15 wt % of the weight of the porous coating; wherein the aggregate amount of metallic particles that are aluminum or aluminum alloys is greater than 78 wt %; wherein the porous coating has an average particle size diameter ranging from about 35 μ
m to about 55 μ
m;wherein the porous coating has a thickness ranging from about 300 μ
m to about 400 μ
m;wherein the porous coating has a median pore diameter ranging from about 7 μ
m to about 12 μ
m; andwherein the porous coating has an overall porosity ranging from about 40% to about 60% based on the overall volume of the porous coating. - View Dependent Claims (15, 16, 17, 18, 19, 20)
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Specification